To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 80 (MBC+). This is an important factor, as coins in better condition tend to fetch higher prices.

2. Starting Price and Average Hammer Price: The starting price is 140 euros, and the average hammer price in previous auctions is 158.2 euros. This suggests that, in general, coins of this reference tend to sell for above their starting price.

3. Sales History: The coin has been auctioned 32 times, of which it has sold 31 times. This indicates high demand and good interest from collectors.

4. Previous Prices: Looking at previous hammer prices, we can see that coins with a similar condition (around 80) have reached hammer prices that vary, but some have gone up to 170 euros or more.

5. Recent Trends: In the most recent auctions, hammer prices have been in the range of 160 to 180 euros for coins of similar condition.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 170 to 200 euros. This is based on the history of hammer prices and the current condition of the coin. However, since the starting price is 140 euros, it is likely that buyers will be willing to bid beyond this price, especially if there is interest in the coin.